Tom Cruise is used to playing the serious action hero, but the 56-year-old actor struggled to keep a straight face while performing a rendition of "Mad Lib Theater" on Monday's episode of The Tonight Show.

The Mission: Impossible—Fallout star helped Jimmy Fallon write a script for a dramatic spy scene using Mad Libs—a series of fill-in-the-blank phrases that are strung together to tell a silly story. For instance, when Fallon asked him to come up with a cute name for a puppy, Cruise replied "my little cookie." And when the host asked him for a funny word, he replied "pollywog."

The dynamic duo then acted out a dramatic spy scene based on the mix of phrases. The result was so hilarious that it had both Cruise and the audience laughing.

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